Die



H. P. ARNT ET AL DIE Original File July 16, 1921 m Z v 3 ,K 5 7 m l. A: 4f; 4 x 6 IV 4 m 1 flfi lm v. 44w I BM 67 4 z a. 3 4

v0 x 6 mt. Mi \Jfk .1 e 1 A 4 v .W W. a 1 F Patented Dec. 30, 1924.

UNITED STATES 1,520,921 PATENT oF-iFrCE,

HERALD P. ARNT AND THOMAS 1\T. AIKENS, OF LAKEWOOD, GEE-I10.

DIE.

Application filed July 16, 1921, Serial No. 485,352. Renewed October 2, 1924.

To all whom it may concern;

de it known that we, HERALD P. AnN'r and THOMAS N. Alinnxs, a citizen of the United States of America, and a subject 01.

5 the King oft Great Britain, respectively, re-

siding at Lakewood, in the county of Guyahoga and "State of Ohio, have invented a new and useful Improvement in Dies, of which the following is a specification, the principle of the invention being herein explained and the best mode in which we have contemplated applying that principle, so as to distinguish it from other inventions.

Our invention relates to a trimming die 13 and more particularly to a die adapted to trim ott certain edges of a partially formed tubular metal wheelspoke after it has been Shaped as shown described and claimed in our copending application filed July 16,,

20 1921, SBI'ial'NO. 485,354.-

he blank, preparatory to the employment of a die embodying our present invention, will have hadimparted to it a concavo-convex shape including a small felloe end of U-shaped cross section, an elongated middle section of larger U-shaped section and a still larger nave end of squared -U-shaped cross section, that is to Say, having two substantially parallel sides connected at one end with a relatively perpendicular wall. Our

die, as exemplified in the drawings, is purposed-to trim off: pairs of substantially parallel end Surfaces along angularly related edges, and also a connecting edge.

5 Adverting to the drawings:

Figure I is a part side elevation and part section of our trimming dies.

Figure II is a plan section on line II-II of Figure I.

4 Figure III is a section on line III--III of Figure II.

Figure IV is a section on line IV--IV of Figure I.

Figure V is a section on line VV of 4 Figure II.

Figures VI and VII are sections taken on line VII-VII of Figure II showing the dies in open and closed positions respectively.

50 With a bottom shoe 1 a top shoe 2 is adapted to cooperate by movement toward and away from it in a well known manner, and under the control of guide pins 3. A mandrel l of peculiar shape and itself having a cutting edge to be later described is all the figures, but includes a shoulder 8 around which the reduced ifello e end of the spoke is "to be seated, a middle conical section 9 and aflat surface 10 inclined with respect to the axis of the spoke against which the flat interjacent na ve end 0t the partially formed spoke is to abut. The partially formed spoke blank B which is to have certain edges trimmed off after the manner of our present invention is of U- shaped cross section and iS-intended to envelop the mandrel by an insertion movement in the direction of the line of vision in which Figure I is seen or in a direction to the right when the parts are in the position shown in Figure VI. lVhen-this is done the small cylindricallycurved outer end of the spoke blank 13 seats against the portion 8 of the mandrel, the middle conical surface section of the spoke blank seats against the portion '9 of the mandrel and the interj acen't 'fia't nave end of the spoke blank B fits against the portion 100i the mandrel.

Guides 11 and 12 are detachza b'ly secured to the top shoe 2 and are adapted when the latter descends to closely confine the spoke blank B in its position against the mandrel as clearly appears in Figures II and III. A cutting punch 13 is fashioned with a cutting edge 1 1 adapted, successively during its descending movement, to shear off two lateral straight edged pieces and b of the Spoke blank B. This the cutting edge 14 does in co-action with an upper corner 15 of the mandrel and an upper corner 16 of a stationary die member 17 Beyond the nave end of the spoke blank B is mounted another L-shaped die 18, best seen in Figure IV which includes a cutting edge 19 adapted to shear the interjacent upright edge 19 of the angular U-shaped nave end section of the blank B. The die 18 is also fashioned with a horizontal top cutting edge 20 adapted to shear off across the upper nave end of the spoke blank B a piece before, in co-action with the corresponding upper edge of the mandrel 4. The lower parallel end edge 21 of the mandrel acts as a cutting edge in co-action with the stationary die 17 to shear oti a strip 6 as clearly appears in Figure V.

In operation, while the mandrel 4 is exposed and in its raised position, as shown in Figure VI, the blank B is slipped thereon from the side, after which the downward movement of the top shoe 2 first causes the guides 11 and 12 to hold the blank B in place. Shortly thereafter, the yielding plunger 6 engages the top of the blank B to move it together with the mandrel 4: down against the stationary die 17. Next, the cutting edges 14, 19 and 20 will tunetionate, and also the cutting edge 21 of the mandrel. The latter cuts off the strip 12 against the stationary die 17 whereas the cutting edge 14 will successively cut oil the strips 6 and b and carry them to the position shown in Figure VII. In the mean time, the cutting edge 20 will have moved downwardly some distance further than the corresponding upper edge of the mandrel 4 as may be seen in Figure V. Be-

tween the times of cutting of the strips 6 and b the upright edge 6 is being continuously sheared. After the release of the punch mechanism and a reassumption of the parts from their positions as appears in Figure VII to their positions as appears in Figure VI the trimmed blank B may be withdrawn and another substituted.

We claim 1. The combination of a punch, a mandrel having a cutting edge, a stationary die, a die fixedly carried by said punch and means for moving the mandrel past the stationary die and the other die relatively to the mandrel.

2. Die mechanism comprising the combination with a bottom shoe, a mandrel adapted to rest thereon and a pair of cutting F dies adapted to shear ofii edges of a blank,

supported on said mandrel, along lines lying some in parallel and some in angularly related planes.

3. Die mechanism comprising the combination with a bottom shoe including a cutting edge, a mandrel having a cutting edge and movable relatively thereto, and a punch carrying a cutting die adapted simultaneously to shear off edges of a blank, supported on said mandrel, along angularly related lines lying in the same plane.

4. Die mechanism comprising the combination with a bottom shoe including a cutting edge, a movable mandrel, a punch, means thereon adapted to engage and move said mandrel against said shoe, and a pair of cutting dies carried by said punch and provided with cutting edges one pair of which are disposed in the same plane and another pair in different planes.

5. Die mechanism comprising the combination with a bottom shoe including a cut ting edge, a mandrel having a cutting edge and movable relatively thereto, and a punch carrying a cutting die adapted successively to shear ofi' edges of a blank, supported on said mandrel, along pairs of angularly re lated lines lying in parallel planes respectively.

6. The method of operating die mechanism which consists in holding angularly related edges of a blank against a suitable mandrel, and then causing first the mandrel in cooperation with a stationary die and then a cutting die in cooperation with the mandrel to shear off substantially parallel edges of the blank.

7 The method of cutting a blank ot' U-shaped cross section which consists in successively cutting the two opposed end portions each along angularly related lines and continuously cutting the interjacent portion of the blank during the interval between said successive cuts.

Signed by us, this 5th day of July, 1921.

HERALD P. ARNT. THOMAS N. AIKENS. 

